Deep Drill-Braced Monuments
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Deeply anchored, drill-braced monuments consists
of a vertical, schedule 80, galvanized pipe mounted in non-shrink grout in a 4.5"
diameter hole drilled to about 40' deep, laterally stabilized by 4 additional rods
welded to the top of the monument, each anchored 40' deep (minimum), 4.5" to
4.75" diameter holes. Each anchor hole will be cased in the upper 12' - 14'
with 2.5' diameter, schedule 80 PVC wrapped with 3/4' thick refrigeration foam
protected by layers of strapping tape and duct tape. We have a detailed
Statement of Work (SOW) for the monument construction. If you are interested in
receiving a PDF copy of the SOW, please e-mail
charlier@geology.cwu.edu
 Drill rig at the Goldendale Observatory Site |
 Drilling northern angle hole at Cape Blanco |
 Over four days to was needed to complete Cape Blanco drilling |
Ancillary Equipment
We used Trimble SSI receivers and choke ring antennas with stainless steel
recoverable antenna mounts on our drilled braced monuments. The antenna mount was
modifed from a Mark Smith (JPL) and Frank Wyatt (Scripps) design. We are now using
the standard SCIGN-type anentta adapter and modifying existings sites for SCIGN-type radomes.
All of our sites have secure and covered facilities. We use
NEMA/EEMAC Type I enclosures with bulkhead fittings.
The enclosures contains the GPS receiver, U.S. Robotics 56 kbs modem or Freewave radio
modem and heavy duty surge protectors. The surge protectors isolate all components
from lighting strikes or AC power surges.
 Freshly painted monument with antenna |
 Type I NEMA utility box, with GPS receiver and electronics located in maintanence shed |
 Sunset on new install |